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   <TITLE>Search for R-parity Violating Decays of the Sneutrino into $e\mu$, $\mu\tau$ and $e\tau$ Pairs in
$p\bar{p}$ Collisions at $\sqrt{s} = 1.96$ TeV</TITLE>
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               Search for R-parity Violating Decays of the Sneutrino into $e\mu$, $\mu\tau$ and $e\tau$ Pairs in
$p\bar{p}$ Collisions at $\sqrt{s} = 1.96$ TeV)
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  We present a search for a heavy sneutrino decaying into two leptons of
  different flavors, predicted in R-parity violating supersymmetric
  models. The search is based on 1~${\rm fb^{-1}}$ of data collected
  in $p \bar{p}$ collisions by the CDF II Detector at the Fermilab
  Tevatron. Our results are consistent with the Standard Model
  expectations and we present 95 \% C.L. upper limits on $\sigma
  \times \rm BR$ ($ p \bar{p} \rightarrow
  \widetilde{\nu}_{\tau}\rightarrow e\mu,e\tau,\mu\tau$
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   <LI><B>Authors:
       <A HREF="mailto:canepa@fnal.gov">Anadi Canepa</A>,
       <A HREF="mailto:lockyer@triumf.ca">Nigel S. Lockyer</A>, 
       <A HREF="mailto:murat@fnal.gov">Pavel Murat</A> and 
       <A HREF="mailto:yanjuntu@fnal.gov">Yanjun Tu</A>
       </FONT></B>
   <LI><B>Re-Blessed: <FONT COLOR="#000080">
       July 9th, 2009
       </FONT></B>
<!--    <LI><B>Godparents: <FONT COLOR="#000080"> -->
<!--         Anton Anastassov, ByeongRok Ko, Alexei Safonov       -->
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   <BR><BR>

   <LI><B>Data: <FONT COLOR="#000080">
       Run II, 1 fb^-1
       </FONT></B>
<!--    <LI><B>Documentation: -->
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<!--        <br> - Main Note: <A HREF="/cgi-bin/notes/cdfnoteSelGet?number=9405">CDF Note 9405</A> -->
      
<!--        <br> - Supporting notes:  -->
<!--        <br><A HREF="/cgi-bin/notes/cdfnoteSelGet?number=9002">CDF Note 9002</A> -->
<!--        <br><A HREF="/cgi-bin/notes/cdfnoteSelGet?number=8809">CDF Note 8809</A> -->
<!--        <br><A HREF="/cgi-bin/notes/cdfnoteSelGet?number=8470">CDF Note 8470</A> -->
<!--         </B> -->
  
   <LI><B>Public Note: <a href="./cdf9430_pub_v2.pdf">CDF Note 9430</a>
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<!--        <A HREF="/cgi-bin/notes/cdfnoteSelGet?number=9430">CDF Note 9430</A> -->


       </B>
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<BR> <BR>
<P>

<H2>Blessed Plots and Tables:</H2>

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<H3>Control regions (50 GeV/c^2 < M_ll < 110 GeV/c^2) in e#tau channel:</H3>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="etau_dimass_v22_2009.gif">
      <TD>Visible mass (M_ll) of e#tau.
         <A HREF="etau_dimass_v22_2009.eps">EPS</A> or
         <A HREF="etau_dimass_v22_2009.gif">GIF</A> 
        
</TABLE>

<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="etau_vismass_tau_v22_2009.gif">
      <TD>Visible mass of #tau.
         <A HREF="etau_vismass_tau_v22_2009.eps">EPS</A> or
         <A HREF="etau_vismass_tau_v22_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>

<H3>Control regions (50 GeV/c^2 < M_ll < 110 GeV/c^2) in e#mu channel:</H3>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="emu_dimass_v22_2009.gif">
      <TD>Visible mass (M_ll) of e#tau.
         <A HREF="emu_dimass_v22_2009.eps">EPS</A> or
         <A HREF="emu_dimass_v22_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>

<H3>Control regions (50 GeV/c^2 < M_ll < 110 GeV/c^2) in #mu#tau channel:</H3>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="mutau_dimass_v22_2009.gif">
      <TD>Visible mass (M_ll) of e#tau.
         <A HREF="mutau_dimass_v22_2009.eps">EPS</A> or
         <A HREF="mutau_dimass_v22_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>



<H3> Signal Region    </H3>
<H3> e#mu channel    </H3>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="table_emu_2009.gif">
      <TD>SM prediction and observation 
        <A HREF="table_emu_2009.pdf">pdf</A> 
         <A HREF="table_emu_2009.gif">GIF</A> 

        
</TABLE>




<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="emu_unbliding_dimass_v24_2009.gif">
      <TD>dimass of 2 leptons: the observation in data is consistent with the prediction of SM background.
         <A HREF="emu_unbliding_dimass_v24_2009.eps">EPS</A> or
         <A HREF="emu_unbliding_dimass_v24_2009.gif">GIF</A> 
        
</TABLE>


<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="emu_unbliding_int_v24_2009.gif">
      <TD>integral number of events from the SM background and from data 
         <A HREF="emu_unbliding_int_v24_2009.eps">EPS</A> or
         <A HREF="emu_unbliding_int_v24_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>


<H3> e#tau channel    </H3>
<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="table_etau_2009.gif">
      <TD>SM prediction and observation 
        
         <A HREF="table_etau_2009.pdf">PDF</A> 
	 <A HREF="table_etau_2009.gif">GIF</A> 
        
</TABLE>


<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="etau_unbliding_dimass_v24_2009.gif">
      <TD>dimass of 2 leptons: the observation in data is consistent with the prediction of SM background.
         <A HREF="etau_unbliding_dimass_v24_2009.eps">EPS</A> or
         <A HREF="etau_unbliding_dimass_v24_2009.gif">GIF</A> 
        
</TABLE>


<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="etau_unbliding_int_v24_2009.gif">
      <TD>integral number of events from the SM background and from data 
         <A HREF="etau_unbliding_int_v24_2009.eps">EPS</A> or
         <A HREF="etau_unbliding_int_v24_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>

<H3> #mu#tau channel    </H3>

<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="table_mutau_2009.gif">
      <TD>SM prediction and observation 
          <A HREF="table_mutau_2009.pdf">pdf</A> 
         <A HREF="table_mutau_2009.gif">GIF</A> 
        
</TABLE>





<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="mutau_unbliding_dimass_v24_2009.gif">
      <TD>dimass of 2 leptons: the observation in data is consistent with the prediction of SM background.
         <A HREF="mutau_unbliding_dimass_v24_2009.eps">EPS</A> or
         <A HREF="mutau_unbliding_dimass_v24_2009.gif">GIF</A> 
        
</TABLE>


<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="mutau_unbliding_int_v24_2009.gif">
      <TD>integral number of events from the SM background and from data 
         <A HREF="mutau_unbliding_int_v24_2009.eps">EPS</A> or
         <A HREF="mutau_unbliding_int_v24_2009.gif">GIF</A> 
        
</TABLE>

<P>
<HR>


<H3> 95% CL. limits on #sigma times BR of tau sneutrino   </H3>

<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="total_sens_dave_v24_obs_2009.gif">
      <TD>integral number of events from the SM background and from data 
         <A HREF="total_sens_dave_v24_ob_2009.eps">EPS</A> or
         <A HREF="total_sens_dave_v24_obs_2009.gif">GIF</A> 
        
</TABLE>

<TABLE BORDER="0" CELLPADDING="0" CELLSPACING="8">
    <TR><TH COLSPAN="2" ALIGN="LEFT">
   <TR>
      <TD><IMG HEIGHT="128" SRC="table_limits_2009.gif">
      <TD> 95% CL. limits on #sigma times BR of tau sneutrino.
        
         <A HREF="table_limits_2009.pdf">pdf</A> 
	 <A HREF="table_limits_2009.gif">GIF</A> 
       
</TABLE>
<P>
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This Page 
   was last updated July 10th, 2009 by Yanjun Tu.
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